Polymer Journals

Polymers and Polymer Composites

Logged into APC, CP, IPSAT, PPC, PRR, RRR & PRPRT.

Back  Search



Title: Temperature dependence of tack for polyacrylic block copolymer/tackifier blend
Page Range: p.121-128
Author(s): Kohei Shitajima; Nozomi Karyu; Kyohei Takada; Syuji Fujii; Yoshinobu Nakamura; Yoshiaki Urahama
File size:
Download the pdf (subscribers only)
Buy the pdf (non-subscribers)
Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 23
Issue No: No.3

Abstract
The effect of polymer and tackifier compatibility on tack of pressure-sensitive adhesive (PSA) tape was investigated. Poly(methyl methacrylate)-block-poly(butyl acrylate)-block-poly(methyl methacrylate) triblock copolymer was used as the base polymer and three types of tackifiers, an aliphatic petroleum resin (A), a special rosin ester resin (B), and a rosin phenolic resin (C), were mixed at 10-30 wt.%. Compatibility with the base polymer was greater in the order of C > B > A. Tackifier agglomerates of approximately 10 nm were observed by transmission electron microscopy for the PSA with tackifier C. Similar agglomerates were observed for tackifier B, but the size increased with content. The size for tackifier A was several tens of micrometres. Dynamic mechanical analysis indicated that the glass transition temperature of the poly(butyl acrylate) phase increased upon addition of tackifiers B and C. This trend was more significant for tackifier C. It was not observed for tackifier A. The temperature dependence of tack was measured using a probe tack test. Tack was greater in the order of C = B > A. Tack at higher temperatures was superior for greater tackifier C contents. Tackifier and base polymer compatibility has a strong effect on tack and its temperature dependence. 20 Refs.

Title: Second-order polarizability and temporal stability of epoxy polymers doped with chromophore and with chromophore moieties in the main chain
Page Range: p.129-136
Author(s): Dmitry Mishurov; Roshal A; Oleksandr Brovko
File size:
Download the pdf (subscribers only)
Buy the pdf (non-subscribers)
Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 23
Issue No: No.3

Abstract
Second-order nonlinear optical (NLO) properties and temporary stability of epoxy polymers based on diglycidyl ether of bisphenol A (DGEBA) both doped with p-nitroaniline (p-NA) and functionalised linear polymer DGEBA with p-NA moieties (attached to the bearing main chain) in the main chain (DGEBA-p-NA) have been investigated. Second-order polarizabilities of both p-NA and functionalised linear polymer DGEBA-p-NA were determined by a solvatochromic method. It was shown that this method could be successfully applied to determine the molecular second-order polarizabilities of both low-molecular mass chromophores and polymers with chromophore moieties attached to the chains. The relaxation behaviour of the doped and functionalised poled epoxy polymers has been studied. The crosslinked functionalised polymer DGEBA-p-NA exhibits the highest second-order NLO properties and temporal stability. 20 Refs.

Title: Effect of post spinning modification using potassium permanganate on the thermal specifications of acrylic fibres
Page Range: p.137-140
Author(s): Eslami-Farsani R
File size:
Download the pdf (subscribers only)
Buy the pdf (non-subscribers)
Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 23
Issue No: No.3

Abstract
This study is focused on post spinning treatment of acrylic fibres using 5%wt. potassium permanganate (KMnO4) solution under different impregnation times. The evaluation of initial and modified acrylic fibres by differential scanning calorimetry (DSC) showed that treating acrylic fibres with KMnO4 solution can result in changes of chemical structure and thermal behaviour of fibres. The recorded DSC thermograms of modified samples indicated that with increase of impregnation time, the onset temperature of the cyclisation reaction decreased. Also there was a progressive increase in the difference of onset and endset temperature ((DELTA)T) of chemical reactions in the DSC peak. 26 Refs.

Title: Phase morphology and mechanical properties of aliphatic waterborne polyurethane-ureas: effect of 1,6-hexamethylene diisocyanate (HDI)/isophorone diisocyanate (IPDI) ratio
Page Range: p.141-150
Author(s): Heqing Fu; Kang Liu; Caibin Yan; Weifeng Chen; Yin Wang
File size:
Download the pdf (subscribers only)
Buy the pdf (non-subscribers)
Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 23
Issue No: No.3

Abstract
Aliphatic waterborne polyurethane-ureas (WPUU) were prepared using 1,6-hexamethylene diisocyanate (HDI) and isophorone diisocyanate (IPDI) as mixed diisocyanates. The effects of the HDI/IPDI ratio on the phase morphology of WPUU films including the hydrogen bonding, crystallisation of the soft segment and hard segment, and phase separation were investigated. The relationship between the phase morphology and the mechanical properties was also studied. The FTIR spectrum showed that the hydrogen bonding degree in the hard segments increased as the HDI/IPDI ratio increased. XRD analysis revealed the excellent crystallinity of WPUU films. DSC analysis indicated that the degree of phase separation was improved with increasing HDI/IPDI ratio, and DMA analysis showed that the storage modulus of the WPUU film increased at first and then decreased. When the HDI/IPDI ratio was 4:1, the WPUU films exhibited high tensile strength. 32 Refs.

Title: Three^-dimensional polyacrylamide^-poly(ethylene glycol)/phosphoric acid for high^-temperature proton exchange membranes
Page Range: p.151-158
Author(s): Zhenyi Li; Yansheng Yin; Liqiang Liu
File size:
Download the pdf (subscribers only)
Buy the pdf (non-subscribers)
Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 23
Issue No: No.3

Abstract
We report the feasibility of anhydrous polyacrylamide-poly(ethylene glycol)/phosphoric acid (PAAm-PEG/ H3PO4) semi-interpenetrating network frameworks as high-temperature proton exchange membranes (PEMs). The PEMs are synthesised by imbibing H3PO4 aqueous solution into three-dimensional PAAm-PEG frameworks accompanied with a dehydration process. The electrical properties are optimized by adjusting synthesis conditions such as crosslinker, initiator and PEG dosages. Results show that the H3PO4 loading and therefore the proton conductivities of the PEMs are significantly enhanced at optimal synthesis conditions. The optimal anhydrous proton conductivity is as high as 0.18 S cm-1 at 180 deg C. A fuel cell using a thick membrane as a PEM shows a peak power density of 635 mW cm-2 at 150 deg C with O2 and H2 as the oxidant and fuel, respectively. The high proton conductivities at high temperatures in combination with the simple preparation, low cost, scalable hosts and proton conductors demonstrate the potential use of hydrogel materials in high-temperature PEM fuel cells. 34 Refs.

Title: Factors affecting on the electricity properties of a metal/PET composite during tensile deformation
Page Range: p.159-166
Author(s): Mei-yu Chen; Kan Lai; Run-jun Sun; Hong-tian Fang; Wei Liu
File size:
Download the pdf (subscribers only)
Buy the pdf (non-subscribers)
Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 23
Issue No: No.3

Abstract
The effects of different factors on the electrical properties of a well-bonded metal/PET composite during tensile deformation were systematically analysed, including metal materials, metal coating film thickness and environmental temperature. It was found that, before a crack appearance in the coated metal film, the critical elongation of a well-bonded metal/PET composite depended on the differences of modulus and Poisson's ratio between the coated metal material and PET substrate. After cracking, the metal/PET composites with different metal films showed different elongations when there was a sudden increase in the resistance of the metal/PET composite; the thicker the metal film deposited on PET substrate was, the lower resistance the metal/PET composite had. The thickness of metal film had no obvious effect on the critical elongation of the metal/PET composites. In addition, the resistance of the metal/PET composite increased with the increasing environmental temperature. 22 Refs.

Title: Preparation and characterisation of polyethersulfone filled with silica nanoparticles
Page Range: p.167-174
Author(s): Cheng-Fang Ou; Shing-Jyun Chium
File size:
Download the pdf (subscribers only)
Buy the pdf (non-subscribers)
Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 23
Issue No: No.3

Abstract
This study was performed primarily to investigate the effects of chemical modification on silica surface and the silica content on the thermal and gas barrier properties of a polyethersulphone (PES) matrix. The PES/SiO2 composites composed of PES and three species of SiO2 nanoparticles (AEROSIL A200, R805 and R974) were prepared by solution blending. The thermal behaviour, thermal stability, and morphology of the composites were studied by DSC, TGA and SEM. The oxygen barrier efficiency of the composites was characterised by use of an oxygen transmission rate (OTR) analyser. The composites' properties, such as glass transition temperature (Tg), decomposition temperature (Td), and oxygen barrier, were found to improve. The Tgs of the composites increased significantly with the silica content and the 10 wt.% R805 composite exhibited the highest Tg, which was 28.7 wC higher than that of pure PES (193.8hC). The Tds of these composites increased from 4.9 sC to 10.6 CC with silica content ranging from 0.5~10 wt.%. The added SiO2 leads to an increase in Tg and Td .The oxygen barrier effectiveness of the composites showed significant improvement when compared to pure PES. The 1 wt.% R974 composite exhibited the lowest OTR, a decrease of 62% when compared to pure PES. These results indicate that the PES/SiO2 composites have high potential for flexible polymer substrate applications. 37 Refs.

Title: Tributyl citrate as diluent for preparation of PVDF porous membrane via thermally induced phase separation
Page Range: p.175-180
Author(s): Zhao-Cai Zhang; Chun-Gang Guo; Jing-Lie Lv
File size:
Download the pdf (subscribers only)
Buy the pdf (non-subscribers)
Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 23
Issue No: No.3

Abstract
Poly(vinylidene fluoride) (PVDF) membrane was successfully prepared by PVDF/tributyl citrate (TBC) via thermally induced phase separation (TIPS). TBC was used as diluent for membrane preparation, which is citric acid esters non-toxic, non-odorous, easy to prepare and comparatively cheap. The effects of PVDF content on crystallinity of PVDF and porous structure were investigated by differential scanning calorimetry (DSC), scanning electron microscopy (SEM), mercury porosimetry and pore size analyser instrument. The results showed that PVDF was most able to crystallize and the membrane pore size became more uniform and smaller at higher polymer content. 17 Refs.

Title: The properties and a new preparation of ethylene propylene diene monomer/montmorillonite nanocomposites
Page Range: p.181-190
Author(s): Ming-Chien Yang; Bo-Jyue Kao; Chi-Hui Tsou; Maw-Cherng Suen; Chin-San Wu; Chih-Yuan Tsou; Chih-Kuei Chu; Wei-Hua Yao; Wen-Yan Wu; Wei-Sung Hong; Kueir-Rarn Lee
File size:
Download the pdf (subscribers only)
Buy the pdf (non-subscribers)
Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 23
Issue No: No.3

Abstract
In this study, ethylene propylene diene monomer (EPDM)/organic clay nanocomposites were prepared using melt intercalation to explore how the nanoclay affected their structures and mechanical and thermal properties. Montmorillonite (MMT) modified with hydrochloric acid (HCl) and maleic anhydride (MAH) was employed to improve the compatibility of the EPDM and MMT phases. The effects of the modified clay on the properties of the EPDM were compared with those of commercially available MMTs (Clay10A and Clay30B) synthesised using an alternative modifier. The nanoclay structures of the EPDM/clay nanocomposites were characterised using X-ray diffraction (XRD), and their thermal and mechanical properties were examined a using thermogravimetric analysis (TGA) and universal tensile testing machine. MMT spacing can be increased with the addition of hydrochloric acid and maleic anhydride (MAH). The XRD results showed no diffraction peak for the EPDM and modified MMT (ClayMAH) composites, verifying that the MMT was exfoliated. The TGA results showed that the thermal decomposition temperature and the residual can be enhanced by increasing the ClayMAH content, the pyrolysis temperatures of EPDM/ClayMAH, EPDM/Clay10A, and EPDM/Clay30B are similar because of the barrier effect phenomenon. The mechanical properties can also be improved with additional ClayMAH content because the clay is dispersed in EPDM. A decline in the crosslinking density increases the slidability between polymers, which enhances the mechanical properties of the nanocomposite. ClayMAH is more effective for improving the tensile property compared to Clay10A and Clay30B. 26 Refs.

Title: Preparation of polyaniline/filter-paper composite for removal of coomassie brilliant blue
Page Range: p.191-198
Author(s): Wanwan Liu; Xiaoqiang Li; Mengjuan Li; Yonggui Li; Mingqiao Ge
File size:
Download the pdf (subscribers only)
Buy the pdf (non-subscribers)
Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 23
Issue No: No.3

Abstract
Polyaniline/filter-paper (PANI/FP) composite was prepared by in-situ polymerisation of polyaniline onto filter paper and subsequently evaluated for the removal of Coomassie brilliant blue (CBB) from aqueous solution. Scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and Fourier-transform infrared (FTIR) spectroscopy were used to investigate the morphology and physicochemical properties of PANI/FP composite. Batch experimental results showed that the pH value and temperature could affect the removal capability of the PANI/FP composite. Langmuir and Freundlich models were used to analyse the equilibrium adsorption. Pseudo-first and pseudo-second order models were used to investigate the kinetics of CBB adsorption onto PANI/FP composite. 20 Refs.

Title: Preparation, characterization and anti-bacterial activity of zinc oxide-gelatin nanocomposite film for food packaging applications
Page Range: p.199-204
Author(s): Umamaheswari G; Sanuja S; Vino Arul John; Kanth S V; Umapathy M J
File size:
Download the pdf (subscribers only)
Buy the pdf (non-subscribers)
Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 23
Issue No: No.3

Abstract
Gelatin based composite films were prepared using various crosslinking agents for possible application in the food packaging industry. In the present study, gelatin films were formed by the incorporation of zinc oxide (ZnO) nanoparticles. The ZnO nanoparticles were synthesised by a wet chemical method using zinc nitrate as precursor and starch as stabilising agent. It was characterised by FTIR. Surface morphology and thermal studies were performed by SEM and TGA respectively. The average particle size was calculated from the X-ray diffraction pattern using Scherrer's equation. Mechanical studies were done with a Universal Testing Machine. The distribution of particles was clearly seen by SEM and thermal studies showed that the decomposition temperature of gelatin was increases by the incorporation nano ZnO. The mechanical properties were also improved with increase in concentration of nano ZnO. Antibacterial activities of the films were also studied against S. aureus, V. cholera and E. coli by the disc diffusion method. 22 Refs.

%>